You need to be assigned permissions before you can perform this procedure or procedures. To see what permissions you need, see the "Email address policies" entry in the Email addresses and address books topic.

A user can have multiple proxy email addresses for the same email account (for example, ayla@exchange.mail.contoso.com or ayla@contoso.com). These email addresses can then be applied by priority. For example, consider this scenario: you have two email address policies, and you assign them priorities of 1 and 2. If you create another policy, it will automatically be assigned a priority of 3. However, let’s say you have two policies, and you specify that one of them is priority 1, but the other policy was assigned a default priority of 2 when it was created. In this case, the next policy you create will, by default, become the priority 2 policy. The previous priority 2 policy will be assigned a priority of 3.

Navigate to Mail flow > Email address policies.

Select the email address policy for which you want to change the priority, and then click Increase priority or Decrease priority .

Although the email address policy is already applied to recipients in Georgia, Alabama, and Louisiana, you must include them in the parameter because the parameter overwrites values; it doesn't append values to existing ones.